diff --git a/Makefile b/Makefile
index d1137452c..47b669993 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 include build/config.mak
 
-default: app.$(EXE)
+default: epsilon.$(EXE)
 
 .PHONY: info
 info:
diff --git a/apps/Makefile b/apps/Makefile
index 1253922c6..fe201355d 100644
--- a/apps/Makefile
+++ b/apps/Makefile
@@ -1,4 +1,3 @@
-
 include apps/shared/Makefile
 include apps/home/Makefile
 include apps/on_boarding/Makefile
@@ -84,6 +83,6 @@ app_image_objs := $(app_images:.png=.o)
 .SECONDARY: $(app_images:.png=.cpp)
 $(app_objs): $(app_image_objs)
 
-app.$(EXE): $(app_objs) $(app_image_objs)
+epsilon.$(EXE): $(app_objs) $(app_image_objs)
 
-products += app.$(EXE) $(app_objs) $(call INLINER_PRODUCTS,$(app_images))
+products += epsilon.$(EXE) $(app_objs) $(call INLINER_PRODUCTS,$(app_images))
diff --git a/build/targets.emscripten.mak b/build/targets.emscripten.mak
index 1515c2bbe..02823a4ca 100644
--- a/build/targets.emscripten.mak
+++ b/build/targets.emscripten.mak
@@ -1,17 +1,16 @@
-app.js: LDFLAGS += -s 'EMTERPRETIFY_FILE="app.etb"'
-app.js: $(app_objs) $(app_image_objs)
+epsilon.js: LDFLAGS += -s 'EMTERPRETIFY_FILE="epsilon.etb"'
 
-app.packed.js: LDFLAGS += --memory-init-file 0
-app.packed.js: $(app_objs) $(app_image_objs)
+epsilon.packed.js: LDFLAGS += --memory-init-file 0
+epsilon.packed.js: $(app_objs) $(app_image_objs)
 
-numworks_simulator.zip: app.packed.js
+numworks_simulator.zip: epsilon.packed.js
 	@rm -rf $(basename $@)
 	@mkdir $(basename $@)
-	@cp app.packed.js $(basename $@)/epsilon.js
+	@cp epsilon.packed.js $(basename $@)/epsilon.js
 	@cp ion/src/emscripten/background.jpg $(basename $@)/
 	@cp ion/src/emscripten/simulator.html $(basename $@)/
 	@echo "ZIP     $@"
 	@zip -r -9 $@ $(basename $@) > /dev/null
 	@rm -rf $(basename $@)
 
-products += $(addprefix app.,js mem etb) app.packed.js numworks_simulator.zip
+products += $(addprefix epsilon.,js mem etb) epsilon.packed.js numworks_simulator.zip